Kollam vs Ulhasnagar
Side-by-side air quality comparison between Kollam and Ulhasnagar.
Live AQI from Open-Meteo CAMS (~45 km global model, updated hourly). Multi-year history from CPCB station data via aqinow.co pipeline (2016–2024, station-level daily records).
AQI Comparison
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kollam averaged an AQI of 84 while Ulhasnagar averaged 117 — a 33-point (39%) gap, with Ulhasnagar the more polluted and Kollam the cleaner of the two. On 396 days when both cities reported, Kollam was cleaner on 285 of them; the average daily gap was 57 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Kollam logged 0% Severe days and 81% Good-or-Satisfactory days; Ulhasnagar was 0% Severe and 46.9% Good-or-Satisfactory. Longest clean-air streaks: Kollam 65 days, Ulhasnagar 74 days.
Year-over-year progress
Kollam has improved by 2 AQI points (2.3%) from 2020 to 2024; Ulhasnagar has improved by 10 AQI points (7.9%) over the same window. The worst recorded day for Kollam reached AQI 272 at Polayathode Kollam (PCB) on 2024-04-06; Ulhasnagar hit AQI 319 at Sidhi Vinayak Nagar (MPCB) on 2023-11-13.
Station-level disparity
Kollam spans 1 CPCB stations with a 0-point spread (min 84, max 84); Ulhasnagar spans 1 stations with a 0-point spread (min 120, max 120).